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mirror_zfs/lib/libspl/include/sys/vtoc.h
Ned Bass e06be58641 Fix for access beyond end of device error 
This commit fixes a sign extension bug affecting l2arc devices.  Extremely
large offsets may be passed down to the low level block device driver on
reads, generating errors similar to

    attempt to access beyond end of device
    sdbi1: rw=14, want=36028797014862705, limit=125026959

The unwanted sign extension occurrs because the function arc_read_nolock()
stores the offset as a daddr_t, a 32-bit signed int type in the Linux kernel.
This offset is then passed to zio_read_phys() as a uint64_t argument, causing
sign extension for values of 0x80000000 or greater.  To avoid this, we store
the offset in a uint64_t.

This change also changes a few daddr_t struct members to uint64_t in the libspl
headers to avoid similar bugs cropping up in the future.  We also add an ASSERT
to __vdev_disk_physio() to check for invalid offsets.

Closes #66
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2010-11-10 21:29:07 -08:00

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ifndef _SYS_VTOC_H
#define _SYS_VTOC_H
#include <sys/dklabel.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Note: the VTOC is not implemented fully, nor in the manner
* that AT&T implements it. AT&T puts the vtoc structure
* into a sector, usually the second sector (pdsector is first).
*
* Sun incorporates the tag, flag, version, and volume vtoc fields into
* its Disk Label, which already has some vtoc-equivalent fields.
* Upon reading the vtoc with read_vtoc(), the following exceptions
* occur:
* v_bootinfo [all] returned as zero
* v_sanity returned as VTOC_SANE
* if Disk Label was sane
* v_sectorsz returned as 512
* v_reserved [all] retunred as zero
* timestamp [all] returned as zero
*
* See dklabel.h, read_vtoc(), and write_vtoc().
*/
#define V_NUMPAR NDKMAP /* The number of partitions */
/* (from dkio.h) */
#define VTOC_SANE 0x600DDEEE /* Indicates a sane VTOC */
#define V_VERSION 0x01 /* layout version number */
#define V_EXTVERSION V_VERSION /* extvtoc layout version number */
/*
* Partition identification tags
*/
#define V_UNASSIGNED 0x00 /* unassigned partition */
#define V_BOOT 0x01 /* Boot partition */
#define V_ROOT 0x02 /* Root filesystem */
#define V_SWAP 0x03 /* Swap filesystem */
#define V_USR 0x04 /* Usr filesystem */
#define V_BACKUP 0x05 /* full disk */
#define V_STAND 0x06 /* Stand partition */
#define V_VAR 0x07 /* Var partition */
#define V_HOME 0x08 /* Home partition */
#define V_ALTSCTR 0x09 /* Alternate sector partition */
#define V_CACHE 0x0a /* Cache (cachefs) partition */
#define V_RESERVED 0x0b /* SMI reserved data */
/*
* Partition permission flags
*/
#define V_UNMNT 0x01 /* Unmountable partition */
#define V_RONLY 0x10 /* Read only */
/*
* error codes for reading & writing vtoc
*/
#define VT_ERROR (-2) /* errno supplies specific error */
#define VT_EIO (-3) /* I/O error accessing vtoc */
#define VT_EINVAL (-4) /* illegal value in vtoc or request */
#define VT_ENOTSUP (-5) /* VTOC op. not supported */
#define VT_ENOSPC (-6) /* requested space not found */
#define VT_EOVERFLOW (-7) /* VTOC op. data struct limited */
struct partition {
ushort_t p_tag; /* ID tag of partition */
ushort_t p_flag; /* permission flags */
uint64_t p_start; /* start sector no of partition */
long p_size; /* # of blocks in partition */
};
struct vtoc {
unsigned long v_bootinfo[3]; /* info needed by mboot (unsupported) */
unsigned long v_sanity; /* to verify vtoc sanity */
unsigned long v_version; /* layout version */
char v_volume[LEN_DKL_VVOL]; /* volume name */
ushort_t v_sectorsz; /* sector size in bytes */
ushort_t v_nparts; /* number of partitions */
unsigned long v_reserved[10]; /* free space */
struct partition v_part[V_NUMPAR]; /* partition headers */
time_t timestamp[V_NUMPAR]; /* partition timestamp (unsupported) */
char v_asciilabel[LEN_DKL_ASCII]; /* for compatibility */
};
struct extpartition {
ushort_t p_tag; /* ID tag of partition */
ushort_t p_flag; /* permission flags */
ushort_t p_pad[2];
diskaddr_t p_start; /* start sector no of partition */
diskaddr_t p_size; /* # of blocks in partition */
};
struct extvtoc {
uint64_t v_bootinfo[3]; /* info needed by mboot (unsupported) */
uint64_t v_sanity; /* to verify vtoc sanity */
uint64_t v_version; /* layout version */
char v_volume[LEN_DKL_VVOL]; /* volume name */
ushort_t v_sectorsz; /* sector size in bytes */
ushort_t v_nparts; /* number of partitions */
ushort_t pad[2];
uint64_t v_reserved[10];
struct extpartition v_part[V_NUMPAR]; /* partition headers */
uint64_t timestamp[V_NUMPAR]; /* partition timestamp (unsupported) */
char v_asciilabel[LEN_DKL_ASCII]; /* for compatibility */
};
#ifdef _KERNEL
#define extvtoctovtoc(extv, v) \
{ \
int i; \
v.v_bootinfo[0] = (unsigned long)extv.v_bootinfo[0]; \
v.v_bootinfo[1] = (unsigned long)extv.v_bootinfo[1]; \
v.v_bootinfo[2] = (unsigned long)extv.v_bootinfo[2]; \
v.v_sanity = (unsigned long)extv.v_sanity; \
v.v_version = (unsigned long)extv.v_version; \
bcopy(extv.v_volume, v.v_volume, LEN_DKL_VVOL); \
v.v_sectorsz = extv.v_sectorsz; \
v.v_nparts = extv.v_nparts; \
for (i = 0; i < 10; i++) \
v.v_reserved[i] = (unsigned long)extv.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
v.v_part[i].p_tag = extv.v_part[i].p_tag; \
v.v_part[i].p_flag = extv.v_part[i].p_flag; \
v.v_part[i].p_start = (uint64_t)extv.v_part[i].p_start; \
v.v_part[i].p_size = (long)extv.v_part[i].p_size; \
v.timestamp[i] = (time_t)extv.timestamp[i]; \
} \
bcopy(extv.v_asciilabel, v.v_asciilabel, LEN_DKL_ASCII); \
}
#define vtoctoextvtoc(v, extv) \
{ \
int i; \
extv.v_bootinfo[0] = (uint64_t)v.v_bootinfo[0]; \
extv.v_bootinfo[1] = (uint64_t)v.v_bootinfo[1]; \
extv.v_bootinfo[2] = (uint64_t)v.v_bootinfo[2]; \
extv.v_sanity = (uint64_t)v.v_sanity; \
extv.v_version = (uint64_t)v.v_version; \
bcopy(v.v_volume, extv.v_volume, LEN_DKL_VVOL); \
extv.v_sectorsz = v.v_sectorsz; \
extv.v_nparts = v.v_nparts; \
for (i = 0; i < 10; i++) \
extv.v_reserved[i] = (uint64_t)v.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
extv.v_part[i].p_tag = v.v_part[i].p_tag; \
extv.v_part[i].p_flag = v.v_part[i].p_flag; \
extv.v_part[i].p_start = \
(diskaddr_t)(unsigned long)v.v_part[i].p_start; \
extv.v_part[i].p_size = \
(diskaddr_t)(unsigned long)v.v_part[i].p_size; \
extv.timestamp[i] = (uint64_t)v.timestamp[i]; \
} \
bcopy(v.v_asciilabel, extv.v_asciilabel, LEN_DKL_ASCII); \
}
#endif /* _KERNEL */
#if defined(_SYSCALL32)
struct partition32 {
uint16_t p_tag; /* ID tag of partition */
uint16_t p_flag; /* permission flags */
daddr32_t p_start; /* start sector no of partition */
int32_t p_size; /* # of blocks in partition */
};
struct vtoc32 {
uint32_t v_bootinfo[3]; /* info needed by mboot (unsupported) */
uint32_t v_sanity; /* to verify vtoc sanity */
uint32_t v_version; /* layout version */
char v_volume[LEN_DKL_VVOL]; /* volume name */
uint16_t v_sectorsz; /* sector size in bytes */
uint16_t v_nparts; /* number of partitions */
uint32_t v_reserved[10]; /* free space */
struct partition32 v_part[V_NUMPAR]; /* partition headers */
time32_t timestamp[V_NUMPAR]; /* partition timestamp (unsupported) */
char v_asciilabel[LEN_DKL_ASCII]; /* for compatibility */
};
#define vtoc32tovtoc(v32, v) \
{ \
int i; \
v.v_bootinfo[0] = v32.v_bootinfo[0]; \
v.v_bootinfo[1] = v32.v_bootinfo[1]; \
v.v_bootinfo[2] = v32.v_bootinfo[2]; \
v.v_sanity = v32.v_sanity; \
v.v_version = v32.v_version; \
bcopy(v32.v_volume, v.v_volume, LEN_DKL_VVOL); \
v.v_sectorsz = v32.v_sectorsz; \
v.v_nparts = v32.v_nparts; \
v.v_version = v32.v_version; \
for (i = 0; i < 10; i++) \
v.v_reserved[i] = v32.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
v.v_part[i].p_tag = (ushort_t)v32.v_part[i].p_tag; \
v.v_part[i].p_flag = (ushort_t)v32.v_part[i].p_flag; \
v.v_part[i].p_start = (unsigned)v32.v_part[i].p_start; \
v.v_part[i].p_size = (unsigned)v32.v_part[i].p_size; \
} \
for (i = 0; i < V_NUMPAR; i++) \
v.timestamp[i] = (time_t)v32.timestamp[i]; \
bcopy(v32.v_asciilabel, v.v_asciilabel, LEN_DKL_ASCII); \
}
#define vtoc32toextvtoc(v32, extv) \
{ \
int i; \
extv.v_bootinfo[0] = v32.v_bootinfo[0]; \
extv.v_bootinfo[1] = v32.v_bootinfo[1]; \
extv.v_bootinfo[2] = v32.v_bootinfo[2]; \
extv.v_sanity = v32.v_sanity; \
extv.v_version = v32.v_version; \
bcopy(v32.v_volume, extv.v_volume, LEN_DKL_VVOL); \
extv.v_sectorsz = v32.v_sectorsz; \
extv.v_nparts = v32.v_nparts; \
extv.v_version = v32.v_version; \
for (i = 0; i < 10; i++) \
extv.v_reserved[i] = v32.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
extv.v_part[i].p_tag = (ushort_t)v32.v_part[i].p_tag; \
extv.v_part[i].p_flag = (ushort_t)v32.v_part[i].p_flag; \
extv.v_part[i].p_start = (diskaddr_t)v32.v_part[i].p_start; \
extv.v_part[i].p_size = (diskaddr_t)v32.v_part[i].p_size; \
extv.timestamp[i] = (time_t)v32.timestamp[i]; \
} \
bcopy(v32.v_asciilabel, extv.v_asciilabel, LEN_DKL_ASCII); \
}
#define vtoctovtoc32(v, v32) \
{ \
int i; \
v32.v_bootinfo[0] = v.v_bootinfo[0]; \
v32.v_bootinfo[1] = v.v_bootinfo[1]; \
v32.v_bootinfo[2] = v.v_bootinfo[2]; \
v32.v_sanity = v.v_sanity; \
v32.v_version = v.v_version; \
bcopy(v.v_volume, v32.v_volume, LEN_DKL_VVOL); \
v32.v_sectorsz = v.v_sectorsz; \
v32.v_nparts = v.v_nparts; \
v32.v_version = v.v_version; \
for (i = 0; i < 10; i++) \
v32.v_reserved[i] = v.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
v32.v_part[i].p_tag = (ushort_t)v.v_part[i].p_tag; \
v32.v_part[i].p_flag = (ushort_t)v.v_part[i].p_flag; \
v32.v_part[i].p_start = (unsigned)v.v_part[i].p_start; \
v32.v_part[i].p_size = (unsigned)v.v_part[i].p_size; \
} \
for (i = 0; i < V_NUMPAR; i++) { \
if (v.timestamp[i] > TIME32_MAX) \
v32.timestamp[i] = TIME32_MAX; \
else \
v32.timestamp[i] = (time32_t)v.timestamp[i]; \
} \
bcopy(v.v_asciilabel, v32.v_asciilabel, LEN_DKL_ASCII); \
}
#define extvtoctovtoc32(extv, v32) \
{ \
int i; \
v32.v_bootinfo[0] = extv.v_bootinfo[0]; \
v32.v_bootinfo[1] = extv.v_bootinfo[1]; \
v32.v_bootinfo[2] = extv.v_bootinfo[2]; \
v32.v_sanity = extv.v_sanity; \
v32.v_version = extv.v_version; \
bcopy(extv.v_volume, v32.v_volume, LEN_DKL_VVOL); \
v32.v_sectorsz = extv.v_sectorsz; \
v32.v_nparts = extv.v_nparts; \
v32.v_version = extv.v_version; \
for (i = 0; i < 10; i++) \
v32.v_reserved[i] = extv.v_reserved[i]; \
for (i = 0; i < V_NUMPAR; i++) { \
v32.v_part[i].p_tag = (ushort_t)extv.v_part[i].p_tag; \
v32.v_part[i].p_flag = (ushort_t)extv.v_part[i].p_flag; \
v32.v_part[i].p_start = (unsigned)extv.v_part[i].p_start; \
v32.v_part[i].p_size = (unsigned)extv.v_part[i].p_size; \
} \
for (i = 0; i < V_NUMPAR; i++) { \
if (extv.timestamp[i] > TIME32_MAX) \
v32.timestamp[i] = TIME32_MAX; \
else \
v32.timestamp[i] = (time32_t)extv.timestamp[i]; \
} \
bcopy(extv.v_asciilabel, v32.v_asciilabel, LEN_DKL_ASCII); \
}
#endif /* _SYSCALL32 */
/*
* These defines are the mode parameter for the checksum routines.
*/
#define CK_CHECKSUM 0 /* check checksum */
#define CK_MAKESUM 1 /* generate checksum */
#if defined(__STDC__)
extern int read_vtoc(int, struct vtoc *);
extern int write_vtoc(int, struct vtoc *);
extern int read_extvtoc(int, struct extvtoc *);
extern int write_extvtoc(int, struct extvtoc *);
#else
extern int read_vtoc();
extern int write_vtoc();
extern int read_extvtoc();
extern int write_extvtoc();
#endif /* __STDC__ */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_VTOC_H */
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